The children cooperated with their teachers in keeping their classroom clean.这句话中的in keeping
题目
The children cooperated with their teachers in keeping their classroom clean.这句话中的in keeping
答案
孩子们协助老师保持教室清洁
cooperate with sb in doing sth 是词组 协助某人在某事上
举一反三
已知函数f(x)=x,g(x)=alnx,a∈R.若曲线y=f(x)与曲线y=g(x)相交,且在交点处有相同的切线,求a的值和该切线方程.
我想写一篇关于奥巴马的演讲的文章,写哪一篇好呢?为什么好
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